I found preparing for the test more difficult than the test itself. That's the way it should be though. I read only three books--two of which were pretty much of no value to me due to content and writing style. The rest of my knowledge simply came from my work experience. As for the poster's linked .PDF, it's useless. I didn't get anything out of it that I didn't already know from reading ISC2's site, the three books, and various public sources on the Internet.